Door handle lock



July 19, 1960 A. SAARENTQ 2,945,719

DOOR HANDLE LOCK Filed Feb. 21, 1958 I6) (/7 by w I INVENTOR. A UL/S 5AA QEA/TO United a es P te DOOR HANDLE LOCK Aulis Saarento, Helsinki, Finland, assignor to Ansala Oy.,

' Helsinki, Finland, a company of Finland Filed Feb. 21, 1958, Ser. No. 716,713 Claims priority, application- Finland Feb. 26, 1957 '5 Claims. Cl. 292-169) Of a good door handle lock it is demanded that the door handle with certainty returns to its horizontal position and that, when the door is shut without pressing downthe door handle, the latch bolt is easily pushed in without movement of the door handle.

The object of this invention is to obtain a door handle lock, that embodies the above mentioned requirements and besides will be also in other respects advantageous in comparison to constructions known hitherto. Thus, the invention relates to a door handle lock comprising a spring-loaded latch bolt and a bushing cooperating with it, which is pivoted for a door handle and the invention is characterized thereby, that one of the ends of the spring for the latch bolt by means of a guiding device is arranged to lie against a guiding surface of the bushing, which is so formed that the power necessary for the turning of the door handle principally is even during the whole period of motion.

Other objects and features characterized in the invention and the advantages of the door handle lock according to the invention will be seen from the following, where the invention is described more in detail with reference to an embodiment shown in the accompanying drawing.

In the drawing Figure 1 shows a door handle lock according to the invention in section, along the line II I of Figure 2,. while Figure 2 shows an elevational view of the door handle lock partly in section. Figures 3a and 3b show a clevis used for the assembly of the door handle look.

In the drawing 1 designates a latch bolt, the head of which moves in a guiding piece 10 for the bolt and which locks into a counter-escutcheon in the door case. The latch bolt is provided with a pin 2 guiding the bolt spring 5 in a manner set out below. The latch bolt is further provided with two legs 3 with shoulders 4 at the ends, which shoulders are contacted behind projections 9 of a bushing 6 for the handle.

The above mentioned parts are connected by means of a clevis 12 (Figs. 3a, b) fixed to shoulders 11 on the guiding piece for the latch bolt. One leg of the clevis is a little shorter than the other so that the latch bolt guiding piece 10 can be swung as may be needed in correspondence with the ch-amfering of the door. In the clevis 12 there are holes 13 rotatably mounting to the bushing 6 and from these holes slots 14 extend to provide a guideway for the spring 5 mentioned in the following.

The bushing 6 is provided with a square hole 7 into which the door handle (not shown) is entered. The door handle can be of any known type. On the bushing 6 there are further provided curved, cam like, guiding surfaces 8 which rise symmetrically away from a transverse recess 6a in the peripheral surfaces of the bushing centered with respect to the slots 14 ending in the above mentioned projections 9, which latter cooperate by means of the shoulders 4 with the legs 3 of the latch bolt. The head 15 of the guideway for the bolt spring 5 normally seats in the recess 6a. The U-formed shank 16 of said guideway guides the coil spring 5 and in its turn is guided by the pin 2 which slides within it. The projections 17 at the ends of the head 15 of the guide: way are guided by the slots 14 of clevis 12. p

The door handle lock shown in the drawing functions as follows. When the door handle is turned downwardly or upwardly, the bushing 6 turns and the appropriate one of the projections 9 pushes the bolt 1 inwards by means of the shoulders 4 against the compression of the spring 5. At the same time the opposite guiding surface 8 of the bushing 6 compresses the spring 5 by means of the guideway head 15, whereby the force necessary for turning the door handle first increases and thereafter is compensated. The guiding surface 8 of the bushing 6 is shaped so that the force necessary for turning the door handle mainly is of the same magnitude during the whole period of motion. For this reason the use of the handle door lock is very comfortable. The guiding surface also helps to return the handle to a horizontal position. When the latch bolt is pressed in without manipulating the door handle, the spring 5 is-compressed only from one end, wherefore, thus, the elasticity of the spring opposing the motion is less than in the foregoing case, and the door can therefore easily be shut by only being pushed without manipulating the handle. At the same time the shoulders 4 both move rearwardly and head 15 of the guideway is more vigorously pressed into the recess 6a in the bushing 6 and so prevents the bushing and thereby the handle carried thereby from turning.

-In the door handle lock according to the invent-ion, there is, thus, one single spring to press out the bolt and return the handle to horizontal position and by means of the shape of the guiding surfaces 8 of the bushing the effect of the spring causing the returning of the handle is stronger than that causing the pressing out of the latch bolt. The solution of the problem according to the invention carries with it, that the locking device consists of few and simple parts, wherefore the production costs are very favourable.

As the force necessary for the pressing down of the door handle is even during the whole period of motion and only of such a magnitude that is necessary for the return of the door handle to horizontal position, the spring action is as small as possible. From this follows that the surface pressure exerted by the elasticity of the spring on the surfaces subjected to wear also is the least possible, which lessens the wear.

Since the spring 5 by means of the shoulders 4 pulls the bushing in one direction, while at the same time the same spring by means of the guideway head 15 tends to force the bushing in' the opposite direction, no friction is created causing wear between the bushing 6 and the holes 13 in the clevis 12.

The door handle lock can be mounted in a bored hole in a door, wherefore the mounting is simply and quickly executed. Due to the fact that the shoulders 4 of the latch bolt are symmetrically arranged as are also the guiding surfaces 8 of the bushing and the shoulders 9 the locking device can be mounted in both rightand left-handed doors. It will also be easy to combine with the locking device any known mechanism for the locking of the handle.

It is understood that the embodiment shown and described is only intended for illustrating purposes, wherefore it can be modified in many ways within the scope of invention.

What I claim is:

1. In door lock construction including a spring loaded Patented July 19, 1960';

. a a 3 latch bolt, a guiding piece ating said bolt and interconnecting means between said bushing and said bolt for effecting the actuation of said bolt on the turning of said bushing, means for rotatably mounting said bushing in fixed relationship with respect to said guiding piece, with the axis of said bushing exe tending transversely with respect to the direction of movement of said latch bolt, said bushing, on the side thereof opposed to said latch bolt, being formed with a longitudinally extending recess in the peripheral surface thereof, actuating portions formed on said bushing and extending radially outwardly from the peripheral surface of said bushing at either side of said recess, said actuatingportions being formed with symmetrical convexly curved actuating surfaces on their peripheral faces, guide means extending between said latch bolt and said bushing for guiding said latch bolt for movement toward and away from said bushing, spring means overlying said guide means and extending between said latch bolt and said bushing, and a head member on said guide means normally seated in said recess in said bushing whereby on the turning of said bushing about its axis said head will ride out of said slot along one of said curved surfaces.

therefor, a bushing for actu- 2. Door lock construction as in claim 1, said recess 25 being formed transversely on a smooth concave curve and said actuating surfaces forming a continuation of the surface of said recess.

3. Door lock construction as in claim 2, the curvature of said actuating surfaces flattening as it proceeds away from said recess whereby the force necessary to turn said bushing to retract said latch bolt is substantially even during the full extent of the turning.

4. Door lock construction as in claim 1, said guide means including a pin extending from said latch bolt and a member U-shaped in cross section telescopically overlying said pin.

5. Door lock construction ascin claim 1, said means for rotatably mounting said bushing being in the form of a clevis formed with opposed bushing mounting openings therethrough, said clevis being formed with slots through the legs thereof extending away from said openings toward the open end of the clevis and said guide means being formed with laterally extending projections, said projections being slidably seated in said slots.

References Cited in the file of this patent UNITED STATES PATENTS 2,343,249 Spinello Mar. 7, 1944 2,454,928 Kalwo Nov. 30, 1948 FOREIGN PATENTS 456,691 Great Britain Nov. 13, 1936 

